After keeping something of a low profile for a while, Mark Zuckerberg has eventually started to address the Cambridge Analytica scandal. He was asked to testify before Congressional committees, and ultimately agreed to do so. Today is the first of two appearances he will make this week. At 2:15PM ET, Zuckerberg will speak about Facebook user data and privacy in front of the Senate Commerce, Science and Transportation Committee and the Senate Committee on the Judiciary at the “Facebook, Social Media Privacy, and the Use and Abuse of Data” hearing. You can watch his testimony right here. See also: How…